Microbiologists use the Gram stain to aid in the identification of bacteria

Microbiologists use the gram stain to aid in the

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21) Microbiologists use the Gram stain to aid in the identification of bacteria. What is the major difference between Gram-positive and Gram-negative bacteria? A) presence or absence of peptidoglycan in the cell wall B) presence or absence of outer plasma membrane C) structure of the lipids in the plasma membrane D) tolerance to anaerobic environments 22) What major event occurred 65.5 MYA?
LS1 Winter11Name & ID_____KEY______________________6 of 9 23) Why are seedless vascular plants considered paraphyletic rather than monophyletic? 24) Conifers and pines both have needlelike leaves. Why might their leaves be of this type? 25) Which one of the following is not a good strategy for increasing the surface area of an object relative to the volume? A) decrease size B) make flatter C) become more spherical D) increase the amount of branching E) increase the amount of folding
LS1 Winter11Name & ID_____KEY______________________7 of 9 Short Answer. 1.As one traces the evolutionary history of angiosperms back through to the ancestor ofthe eukaryotes, the evolution of at least five mutualistic interactions have led to theecology and physiology of the angiosperms we observe today.a.(20 pts) Briefly identify five, and only five, mutualistic interactions found inmodern plants and the benefit the plant receives. (Hint: the first dates back tothe first eukaryotes)5 of the following, 4 pts each (2 pts for the interaction, 2 pts for the benefit)

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